/*!	 dock_history.cpp
**	 Template File
**
**	Copyright (c) 2002-2005 Robert B. Quattlebaum Jr., Adrian Bentley
**	Copyright (c) 2007, 2008 Chris Moore
**
**	This package is free software; you can redistribute it and/or
**	modify it under the terms of the GNU General Public License as
**	published by the Free Software Foundation; either version 2 of
**	the License, or (at your option) any later version.
**
**	This package is distributed in the hope that it will be useful,
**	but WITHOUT ANY WARRANTY; without even the implied warranty of
**	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
**	General Public License for more details.
**
*/

#ifdef USING_PCH
#	include "pch.h"
#else
#ifdef HAVE_CONFIG_H
#	include <config.h>
#endif

#include <synfig/general.h>

#include "docks/dock_history.h"
#include "app.h"

#include <gtkmm/scrolledwindow.h>
#include <cassert>
#include "instance.h"
#include <synfigapp/action.h>
#include "trees/historytreestore.h"

#include <gui/localization.h>

#endif

using namespace std;
using namespace etl;
using namespace synfig;
using namespace studio;

#define COLUMNID_JUMP		(787584)
#define ColumnID	int

Dock_History::Dock_History():
    Dock_CanvasSpecific("history", _("History"), Gtk::StockID("synfig-history")),
    action_group(Gtk::ActionGroup::create("action_group_dock_history"))
{
    App::signal_instance_deleted().connect(sigc::mem_fun(*this, &studio::Dock_History::delete_instance));
    App::signal_instance_selected().connect(sigc::mem_fun(*this, &studio::Dock_History::set_selected_instance_signal));

    action_group->add(Gtk::Action::create(
                          "clear-undo",
                          Gtk::StockID("synfig-clear_undo"),
                          _("Clear Undo Stack"),
                          _("Clear the undo stack")
                      ),
                      sigc::mem_fun(
                          *this,
                          &Dock_History::clear_undo
                      )
                     );
    action_group->add(Gtk::Action::create(
                          "clear-redo",
                          Gtk::StockID("synfig-clear_redo"),
                          _("Clear Redo Stack"),
                          _("Clear the redo stack")
                      ),
                      sigc::mem_fun(
                          *this,
                          &Dock_History::clear_redo
                      )
                     );
    action_group->add(Gtk::Action::create(
                          "clear-undo-and-redo",
                          Gtk::Stock::CLEAR,
                          _("Clear Undo and Redo Stacks"),
                          _("Clear the undo and redo stacks")
                      ),
                      sigc::mem_fun(
                          *this,
                          &Dock_History::clear_undo_and_redo
                      )
                     );
    action_group->add(Gtk::Action::create(
                          "undo",
                          Gtk::StockID("synfig-undo"),
                          _("Undo"),
                          _("Undo the previous action")
                      ),
                      sigc::ptr_fun(studio::App::undo)
                     );
    action_group->add(Gtk::Action::create(
                          "redo",
                          Gtk::StockID("synfig-redo"),
                          _("Redo"),
                          _("Redo the previously undone action")
                      ),
                      sigc::ptr_fun(studio::App::redo)
                     );

    action_group->add(Gtk::Action::create("toolbar-history", _("History")));
    App::ui_manager()->insert_action_group(action_group);

    Glib::ustring ui_info =
        "<ui>"
        "	<toolbar action='toolbar-history'>"
        "	<toolitem action='undo' />"
        "	<toolitem action='redo' />"
        "	<toolitem action='clear-undo' />"
        "	<toolitem action='clear-redo' />"
        "	<toolitem action='clear-undo-and-redo' />"
        "	</toolbar>"
        "</ui>"
        ;

    App::ui_manager()->add_ui_from_string(ui_info);

    action_group->set_sensitive(false);

    set_toolbar(*dynamic_cast<Gtk::Toolbar*>(App::ui_manager()->get_widget("/toolbar-history")));
    add(*create_action_tree());
}

Dock_History::~Dock_History()
{
}

void
Dock_History::init_instance_vfunc(etl::loose_handle<Instance> instance)
{
    instance->signal_undo_redo_status_changed().connect(
        sigc::mem_fun(*this, &Dock_History::update_undo_redo)
    );
}

Gtk::Widget*
Dock_History::create_action_tree()
{
    studio::HistoryTreeStore::Model history_tree_model;
    action_tree = manage(new class Gtk::TreeView());
    {
        Gtk::TreeView::Column* column = Gtk::manage(new Gtk::TreeView::Column(""));

        Gtk::CellRendererToggle* toggle_cr = Gtk::manage(new Gtk::CellRendererToggle());
        toggle_cr->signal_toggled().connect(sigc::mem_fun(*this, &studio::Dock_History::on_action_toggle));

        column->pack_start(*toggle_cr); // false = don't expand.
        column->add_attribute(toggle_cr->property_active(), history_tree_model.is_active);
        column->set_resizable();
        column->set_clickable();

        action_tree->append_column(*column);
    }

    {
        Gtk::TreeView::Column* column = Gtk::manage(new Gtk::TreeView::Column(_("Jump")));

        Gtk::CellRendererText* cell_renderer_jump = Gtk::manage(new Gtk::CellRendererText());
        column->pack_start(*cell_renderer_jump, true);

        cell_renderer_jump->property_text() = _("(JMP)");
        cell_renderer_jump->property_foreground() = "#003a7f";

        column->set_resizable();
        column->set_clickable();

        column->set_sort_column(COLUMNID_JUMP);

        action_tree->append_column(*column);
    }
    {
        Gtk::TreeView::Column* column = Gtk::manage(new Gtk::TreeView::Column(_("Action")));

        Gtk::CellRendererText *text_cr = Gtk::manage(new Gtk::CellRendererText());
        text_cr->property_foreground() = Glib::ustring("#7f7f7f");

        // column->pack_start(history_tree_model.icon, false); // false = don't expand.
        column->pack_start(*text_cr);
        column->add_attribute(text_cr->property_text(), history_tree_model.name);
        column->add_attribute(text_cr->property_foreground_set(), history_tree_model.is_redo);

        action_tree->append_column(*column);
    }

    action_tree->set_enable_search(true);
    action_tree->set_search_column(history_tree_model.name);
    action_tree->set_search_equal_func(sigc::ptr_fun(&studio::HistoryTreeStore::search_func));

    action_tree->set_rules_hint();
    action_tree->signal_event().connect(sigc::mem_fun(*this, &Dock_History::on_action_event));
    action_tree->show();

    Gtk::ScrolledWindow *scrolledwindow = manage(new class Gtk::ScrolledWindow());
    scrolledwindow->set_can_focus(true);
    scrolledwindow->set_policy(Gtk::POLICY_AUTOMATIC, Gtk::POLICY_AUTOMATIC);
    scrolledwindow->add(*action_tree);
    scrolledwindow->set_shadow_type(Gtk::SHADOW_ETCHED_IN);
    scrolledwindow->show_all();

    return scrolledwindow;
}

void
Dock_History::clear_undo()
{
    if (selected_instance && App::dialog_message_2b(
                _("Clear History"),
                _("You will not be able to undo any changes that you have made! "
                  "Are you sure you want to clear the undo stack?"),
                Gtk::MESSAGE_QUESTION,
                _("Cancel"),
                _("Clear"))
       ) {
        selected_instance->clear_undo_stack();
    }
}

void
Dock_History::clear_redo()
{
    if (selected_instance && App::dialog_message_2b(
                _("Clear History"),
                _("You will not be able to redo any changes that you have made! "
                  "Are you sure you want to clear the redo stack?"),
                Gtk::MESSAGE_QUESTION,
                _("Cancel"),
                _("Clear"))
       ) {
        selected_instance->clear_redo_stack();
    }
}

void
Dock_History::clear_undo_and_redo()
{
    if (selected_instance && App::dialog_message_2b(
                _("Clear History"),
                _("You will not be able to undo or redo any changes that you have made! "
                  "Are you sure you want to clear the undo and redo stacks?"),
                Gtk::MESSAGE_QUESTION,
                _("Cancel"),
                _("Clear"))
       ) {
        selected_instance->clear_undo_stack();
        selected_instance->clear_redo_stack();
    }
}

void
Dock_History::update_undo_redo()
{
    etl::handle<Instance> instance = App::get_selected_instance();

    if (instance) {
        action_group->get_action("undo")->set_sensitive(instance->get_undo_status());
        action_group->get_action("clear-undo")->set_sensitive(instance->get_undo_status());
        action_group->get_action("redo")->set_sensitive(instance->get_redo_status());
        action_group->get_action("clear-redo")->set_sensitive(instance->get_redo_status());
        action_group->get_action("clear-undo-and-redo")->set_sensitive(instance->get_undo_status() || instance->get_redo_status());
    }
}

void
Dock_History::on_undo_tree_changed()
{
    Gtk::TreeModel::Children children(selected_instance->history_tree_store()->children());

    if (!children.size()) {
        return;
    }

    studio::HistoryTreeStore::Model model;

    Gtk::TreeModel::Children::iterator iter, prev = children.end();

    for (iter = children.begin(); iter != children.end(); prev = iter++)
        if ((*iter)[model.is_redo]) {
            if (prev == children.end()) {
                action_tree->get_selection()->unselect_all();
            } else {
                action_tree->scroll_to_row(Gtk::TreePath(prev), 0.5);
                action_tree->get_selection()->select(prev);
            }

            return;
        }

    action_tree->scroll_to_row(Gtk::TreePath(prev), 0.5);
    action_tree->get_selection()->select(prev);
}

void
Dock_History::set_selected_instance_(etl::handle<studio::Instance> instance)
{
    if (studio::App::shutdown_in_progress) {
        return;
    }

    if (on_undo_tree_changed_connection) {
        on_undo_tree_changed_connection.disconnect();
    }

    selected_instance = instance;

    if (instance) {
        on_undo_tree_changed_connection = selected_instance->history_tree_store()->signal_undo_tree_changed().connect(
                                              sigc::mem_fun(*this, &Dock_History::on_undo_tree_changed));

        action_tree->set_model(instance->history_tree_store());
        action_tree->show();
        update_undo_redo();
        action_group->set_sensitive(true);
    } else {
        action_tree->set_model(Glib::RefPtr< Gtk::TreeModel >());
        action_tree->hide();
        action_group->set_sensitive(false);
    }
}

void
Dock_History::set_selected_instance_signal(etl::handle<studio::Instance> x)
{
    set_selected_instance(x);
}

void
Dock_History::set_selected_instance(etl::loose_handle<studio::Instance> x)
{
    if (studio::App::shutdown_in_progress) {
        return;
    }

    // if it's already selected, don't select it again
    if (x == selected_instance) {
        return;
    }

    std::list<etl::handle<studio::Instance> >::iterator iter;

    set_selected_instance_(x);
}

void
Dock_History::delete_instance(etl::handle<studio::Instance> instance)
{
    if (studio::App::shutdown_in_progress) {
        return;
    }

    if (selected_instance == instance) {
        set_selected_instance(0);
    }
}

bool
Dock_History::on_action_event(GdkEvent *event)
{
    studio::HistoryTreeStore::Model model;

    switch (event->type) {
    case GDK_BUTTON_PRESS:
    case GDK_2BUTTON_PRESS: {
        Gtk::TreeModel::Path path;
        Gtk::TreeViewColumn *column;
        int cell_x, cell_y;

        if (!action_tree->get_path_at_pos(
                    int(event->button.x), int(event->button.y),	// x, y
                    path, 				column, 				cell_x, cell_y // int&cell_x,int&cell_y
                )
           ) {
            break;
        }

        const Gtk::TreeRow row = *(action_tree->get_model()->get_iter(path));

        if ((ColumnID)column->get_sort_column_id() == COLUMNID_JUMP) {
            etl::handle<synfigapp::Action::Undoable> action(row[model.action]);

            try {
                if ((bool)row[model.is_undo]) {
                    while (get_selected_instance()->undo_action_stack().size() && get_selected_instance()->undo_action_stack().front() != action)
                        if (get_selected_instance()->undo() == false) {
                            throw int();
                        }
                } else if ((bool)row[model.is_redo]) {
                    while (get_selected_instance()->redo_action_stack().size() && get_selected_instance()->undo_action_stack().front() != action)
                        if (get_selected_instance()->redo() == false) {
                            throw int();
                        }
                }
            } catch (int) {
                return true;
            }
        }

        break;
    }

    case GDK_BUTTON_RELEASE:
        break;

    default:
        break;
    }

    return false;
}

void
Dock_History::on_action_toggle(const Glib::ustring& path_string)
{
    studio::HistoryTreeStore::Model history_tree_model;

    Gtk::TreePath path(path_string);

    const Gtk::TreeRow row = *(selected_instance->history_tree_store()->get_iter(path));

    handle<synfigapp::Action::Undoable> action = row[history_tree_model.action];

    selected_instance->synfigapp::Instance::set_action_status(action, !action->is_active());
}